CO DRYWALL CONTRACTOR EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of gypsum wallboard in
interior construction?
A. To provide structural foundation support
B. To create finished interior wall and ceiling surfaces
C. To replace roof sheathing
D. To serve as plumbing pipe
Correct Answer: B. To create finished interior wall and ceiling
surfaces
Rationale: Gypsum wallboard provides a smooth, durable
surface for interior walls and ceilings and can also provide fire
and sound-resistance properties.
2. Which material is commonly used as the core of standard
drywall panels?
A. Gypsum
B. Concrete
C. Aluminum
D. Fiberglass only
Correct Answer: A. Gypsum
Rationale: Standard drywall consists primarily of a gypsum core
enclosed in paper or an approved facing material.
3. What is the most common drywall thickness for residential
interior walls?
,A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 1-1/2 inches
Correct Answer: C. 1/2 inch
Rationale: 1/2-inch gypsum board is commonly used for
residential wall applications, subject to project requirements.
4. What tool is commonly used to score the face of gypsum
board before snapping it?
A. Utility knife
B. Pipe wrench
C. Cold chisel
D. Framing hammer
Correct Answer: A. Utility knife
Rationale: A sharp utility knife is used to score the paper face
before the panel is snapped along the cut.
5. What should be done after snapping a scored drywall
panel?
A. Wet the panel
B. Cut the back paper
C. Hammer the edge repeatedly
D. Apply primer immediately
Correct Answer: B. Cut the back paper
Rationale: After snapping the board, the remaining back paper
is cut to separate the piece cleanly.
,6. What is the primary purpose of drywall joint tape?
A. To waterproof the roof
B. To reinforce joints between panels
C. To attach studs to concrete
D. To replace screws
Correct Answer: B. To reinforce joints between panels
Rationale: Joint tape reinforces seams and helps prevent
cracking when properly embedded in joint compound.
7. Which fastener is commonly used to attach gypsum board
to wood framing?
A. Drywall screw
B. Roofing nail only
C. Lag bolt
D. Masonry anchor
Correct Answer: A. Drywall screw
Rationale: Proper drywall screws are designed to secure
gypsum board to wood or metal framing without damaging the
board.
8. Why should drywall screws not be driven too deeply?
A. It makes the screw longer
B. It can break the paper facing and reduce holding strength
C. It increases fire resistance
D. It prevents joint finishing
Correct Answer: B. It can break the paper facing and reduce
holding strength
, Rationale: Overdriving screws can tear the paper and weaken
the fastening point.
9. What is joint compound primarily used for?
A. Finishing joints and fastener heads
B. Installing electrical wiring
C. Sealing concrete foundations
D. Framing walls
Correct Answer: A. Finishing joints and fastener heads
Rationale: Joint compound is applied over taped joints, corners,
and fastener heads to create a smooth finished surface.
10. What is the purpose of a drywall taping knife?
A. Cutting steel studs
B. Applying and smoothing joint compound
C. Drilling holes
D. Measuring wall height
Correct Answer: B. Applying and smoothing joint compound
Rationale: Taping knives spread, feather, and smooth joint
compound during finishing.
11. What does "feathering" joint compound mean?
A. Removing all compound from the joint
B. Gradually thinning the compound toward the surrounding
surface
C. Adding water to the wallboard
D. Cutting the drywall edge
Correct Answer: B. Gradually thinning the compound toward
the surrounding surface
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of gypsum wallboard in
interior construction?
A. To provide structural foundation support
B. To create finished interior wall and ceiling surfaces
C. To replace roof sheathing
D. To serve as plumbing pipe
Correct Answer: B. To create finished interior wall and ceiling
surfaces
Rationale: Gypsum wallboard provides a smooth, durable
surface for interior walls and ceilings and can also provide fire
and sound-resistance properties.
2. Which material is commonly used as the core of standard
drywall panels?
A. Gypsum
B. Concrete
C. Aluminum
D. Fiberglass only
Correct Answer: A. Gypsum
Rationale: Standard drywall consists primarily of a gypsum core
enclosed in paper or an approved facing material.
3. What is the most common drywall thickness for residential
interior walls?
,A. 1/8 inch
B. 1/4 inch
C. 1/2 inch
D. 1-1/2 inches
Correct Answer: C. 1/2 inch
Rationale: 1/2-inch gypsum board is commonly used for
residential wall applications, subject to project requirements.
4. What tool is commonly used to score the face of gypsum
board before snapping it?
A. Utility knife
B. Pipe wrench
C. Cold chisel
D. Framing hammer
Correct Answer: A. Utility knife
Rationale: A sharp utility knife is used to score the paper face
before the panel is snapped along the cut.
5. What should be done after snapping a scored drywall
panel?
A. Wet the panel
B. Cut the back paper
C. Hammer the edge repeatedly
D. Apply primer immediately
Correct Answer: B. Cut the back paper
Rationale: After snapping the board, the remaining back paper
is cut to separate the piece cleanly.
,6. What is the primary purpose of drywall joint tape?
A. To waterproof the roof
B. To reinforce joints between panels
C. To attach studs to concrete
D. To replace screws
Correct Answer: B. To reinforce joints between panels
Rationale: Joint tape reinforces seams and helps prevent
cracking when properly embedded in joint compound.
7. Which fastener is commonly used to attach gypsum board
to wood framing?
A. Drywall screw
B. Roofing nail only
C. Lag bolt
D. Masonry anchor
Correct Answer: A. Drywall screw
Rationale: Proper drywall screws are designed to secure
gypsum board to wood or metal framing without damaging the
board.
8. Why should drywall screws not be driven too deeply?
A. It makes the screw longer
B. It can break the paper facing and reduce holding strength
C. It increases fire resistance
D. It prevents joint finishing
Correct Answer: B. It can break the paper facing and reduce
holding strength
, Rationale: Overdriving screws can tear the paper and weaken
the fastening point.
9. What is joint compound primarily used for?
A. Finishing joints and fastener heads
B. Installing electrical wiring
C. Sealing concrete foundations
D. Framing walls
Correct Answer: A. Finishing joints and fastener heads
Rationale: Joint compound is applied over taped joints, corners,
and fastener heads to create a smooth finished surface.
10. What is the purpose of a drywall taping knife?
A. Cutting steel studs
B. Applying and smoothing joint compound
C. Drilling holes
D. Measuring wall height
Correct Answer: B. Applying and smoothing joint compound
Rationale: Taping knives spread, feather, and smooth joint
compound during finishing.
11. What does "feathering" joint compound mean?
A. Removing all compound from the joint
B. Gradually thinning the compound toward the surrounding
surface
C. Adding water to the wallboard
D. Cutting the drywall edge
Correct Answer: B. Gradually thinning the compound toward
the surrounding surface
